Theta UMa
HIP 46853; Theta UMa; 25 UMa
DoubleStar
UMa
Visible
Level 5
Expert level - Requires steady seeing
Physical Properties
Magnitude
3.17
Spectral Type
F7V
Star Color
Yellow
(B-V 0.46)
Distance
44.0 ly
Position & Identifiers
RA
09h 32m 51.4s
Dec
+51° 40' 38.0"
Constellation
UMa
HR
3775
HIP
46853
Bayer
Theta
Flamsteed
25 UMa
Double Cat
7420
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Visibility
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Multiple Star System
Separation
2.6″
Companion Mag
14.0
Position Angle
145°
Star Colors
A: Yellow
Discoverer
BU 1071
Eyepiece View
80x
Dawes: 1.9″
TFOV: 0.6°
Realistic = true angular size
Sep: 2.6″ · PA: 145° · N up, E left
At limit · Rayleigh: 2.3″ · Dawes: 1.9″ · Eff: 3.1″
Size Comparison
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Stellar Lifecycle
Spectral Classification
Hertzsprung-Russell Diagram
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Blackbody Spectrum
Stellar Absorption Spectrum
Simulated absorption spectrum based on spectral type. Hover over lines to identify elements.
Stellar Notes
CPM.
371.0d, K 4.3k/s, V0 +13.0k/s, asini 21.24. Orbit questioned by Morbey and Griffin (1987, ApJ, 317, 343). | Unresolved by speckle interferometry.
Survey Image
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